Add two examples for folder structuring as requested at https://github.com/kataras/iris/issues/748

Former-commit-id: 27c97d005d9cbd2309587b11fc9e2bab85870502

_examples/structuring/mvc/app/controllers/follower/controller.go

@@ -0,0 +1,13 @@
+package follower
+
+import (
+	"github.com/kataras/iris"
+)
+
+type Controller struct {
+	iris.Controller
+}
+
+func (c *Controller) GetBy(id int64) {
+	c.Ctx.Writef("from "+c.Route().Path()+" with ID: %d", id)
+}